Essentials

D 2.5 2.5t 1 .0 36 2.41 2 .93 8t .05(7) 2.365; t .01(7) 3.499; 2.365 2.41 3.499; therefore, the resultsare significant at the .05 level (two-tailed), but not the .01 level. S DN APPENDIX B 249(b) lower D – t .01s D 2.5 – 3.499(1.036) 2.5 – 3.62 –1.12 upper D t .01s D 2.5 3.499(1.036) 2.5 3.62 6.12Because zero is contained in the 99% CI (–1.12 to 6.12), we know thatthe null hypothesis cannot be rejected at the .01 level, two-tailed—consistent with the result in part a.(c) No, you cannot say that imagery instructions caused an increase in recall,because the results could easily be due to a practice effect (participantsperform better the second time they do the task, because of the experiencethey gained from the first time).Chapter 41. (a)No Image Image XY8 14 11211 15 1657 5 3510 16 1609 9 8115 16 2407 8 5616 20 320ΣX 83; ΣY 103; ΣXY 1169; X 10.375; Y 12.875; s x 3.462;s y 5.027; s 2 11.98; s 2x y 25.27r ∑ XY – NXY1 N – 1sx s y 1 4.34 .82417.41 [1169 – (8 10.375 12.875)]8– 117.4